OnClick

The following code snippets can be invoked when a control is clicked on.

Add the SourceTag of a control as a trend in a TrendGraph control on click. The following snippet also shows how static methods on the ControlBase class can be used to get a property from any kind of control, assuming the control has the property specified.

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public void AddTrendOnClick(object sender, EventArgs eventArgs)
{
    // check if control clicked on has a source tag
    string sourceTag;

    // NOTE: use static method on control base that can get property
    // of any control, assuming the property exists on a control
    ControlBase.TryGetProperty(sender, "SourceTag", out sourceTag);
    if (!string.IsNullOrEmpty(sourceTag))
    {
        // trend graph we will add trend to
        string trendGraphName = "TrendGraph1";
        ControlTrendGraph trendGraph = Screen.ScreenControls[trendGraphName] as ControlTrendGraph;

        // check if trend graph already has trend with source tag
        if (IsTrendAdded(trendGraph, sourceTag))
        {
            Log.Info("Trend has already been added.");
            return;
        }

        // add trend
        ControlTrend trend = ControlFactory.CreateControl(ControlKind.Trend) as ControlTrend;
        trend.SourceTag = sourceTag;
        trendGraph.Children.Add(trend);
    }
    else
    {
        Log.Info("Invalid SourceTag.");
    }
}

private bool IsTrendAdded(ControlTrendGraph trendGraph, string sourceTag)
{
    foreach (ControlBase child in trendGraph.Children)
    {
        // NOTE: use static method on control base that can get property
        // of any control, assuming the property exists on a control
        string compareSourceTag;
        ControlBase.TryGetProperty(child, "SourceTag", out compareSourceTag);
        if (sourceTag == compareSourceTag)
            return true;
    }
    return false;
}

Updating the property of a control OnClick. The following snippet shows how to use the OnClick event of a Button control to set the text property of a Label control

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public void Button1_OnClick(object sender, EventArgs eventArgs)
{
    // get label we will set new text on
    string labelName = "Label1";
    ControlLabel label = Screen.ScreenControls[labelName] as ControlLabel;

    // determine and set new text value
    if (label.Text == "Label")
    {
        label.Text = "1";
    } 
    else if (int.TryParse(label.Text ?? "Nan", out int number))
    {
        label.Text = (number + 1).ToString();
    }
    else 
    {
        label.Text = "Error";
    }
}